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2 Sheets- Sheet 1,

' G. F. WILS ON. GRANULAIING ACID FHOSPHATES.

No. 75,334. Patented Mar. 10, 1868.

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WITNESSES.

INVENTOI7.

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GEQRGE R WlLSON. Ob EAST PROVIDENCE, RHODE ISLAND.

Letters Patent No. 75,334, dated Miran 10, 1868.

IMPROVEMEN T IN GRANElLATING ACID PHOSPHATES.

dig: rl3rhnie .rftrrrh loin fl es: ii'tllttfi ifittmt out making part of the ram.

. TO ALL WHOM IT MAY ooNonRn:

Be it known that I, Gnoiion F. WILSON, of East Providence, in the county of Providence, and State of hode Island, have invented e. -new'und improved Mode of Grenulating Acid Phosphate of Lime when mixed with fnrinaceous matter; and I do hereby deolnrethe following to be a-full 5nd exdct descriptionthereof,

reference being hadto the accompanying drawings, and to the letters of reference marked thereon.

The object of my invention is to break into small pieces, not exceeding a. certain maximum size, the lumps oi acid phosphate of lime, when mixed'with furinaceous matter, as produced under Horsfords patents, and when the lumps have hardened to proper condition i'or ranuldtion by spontaneous setting and drying,'asdescribed 'under Wilsons andHorsfords applications for patents, of even date herewith. A

V Myinvontion consists essentially of a. horizontal wire grating of uniform meshes, caused, by reciprocal motion, to slide-backward and forward near, but not in contact with, the under su'rfuceso'f the sides of u. vertical tube or spout or cliuteywhioh is kept filled with lumps of acid to be gmnuletciand constantly under the, pressure of a column of lumps filling the chute above, though the chute itselfis supported independently, and does not at all rest or press upon the wire grater. The friction and pressure unite to reduce the lumps to the fineness requisite to their passing through the meshes of the wire grating. The relations of the port; are erihihitecl in theaocompunying diagrams.

Figure 1 is a. top vietv or the apparatus, and

Figure 2 a sectional view, showing the relations of the working parts: v

A A, figs. 1 and 2, is the tube orchute through which the coarso lumps are slipplled from above. B B is the square frame, open at top and'bottom, and is divided by one or more partitions, supported on the frame in such manner that the sieve or grater G G may move iinder, but without coming into contact with it. The oscillating-grate G G, nnderncoth the bottom of the box 13 B, receives a. reciprocating motion through the cross-bar O O, and the rods 1 r, from the crank S S,'set in action by the pulley T, which motion is regulntedby the fiy-wheel F, and stopped by slipping the belt to the loose pulley T. H is a. hopper underneath the-sieve, for conveying .the product of granulation, by oftrough or'otherivise, ,to the elevdtor'E E.

The practical operation of the maohine is'as follows: Reciprocal motionhavingbeon'co mmuu'icotcd to the groter or sievo G, the chute A A and box B B'are filled." The square box B B being filled, and nearlybnt not quite contact viththewire grater, as previously described, the lumps, undor'the pressure of the'constontly filledcolumn of lamps in the chute-A A, are rasped by the movement of the grater-alternately from right to left. As the lumps are abraded, the grdnulated acid drops thronghthe grate G into the hopper H, and slides to the bottom, to be carried up by the elevatorE E. p Q

- I hevefound it convenient to have the openings in the meshes of the sieve or grater about a quarter of an inch -sq uhre in which they ire tidaptocl in their sizeto the space betweeii the slats in the'drying-frames, described in my application for a patent drier, of ovcn da-tc'hc rewitlil It is'conveuleut thotthe lumps ofgrannlutod ocid should not be reduced to powder, but onlyto coarse grit-ins, that will permit its being handled without onnoyaneeto the men, and yet present. considerable surface to the drying action of heated air.

What I claim, aud desire to secure by Letters Potent'of th e United States, 'is-- 1. The process of dividing the lumps of mixed acid phosphate of limo'and furinuccous matter into small lumps, substantially as and for the purpose specified. I I

2. The combination of the feeding-spout and vibrating sieve or grater, constructed-and operated substuntioliy as above described, and for the'purpose above set forth.

' GEO. F. WILSON.

Wftnessos Winner Heooh, w, H. moment; 

